1M token is around 750k words, in English. According to Wolfram Alpha that is: Single-spaced document: 1500 pages Double-spaced document: 3000 pages Book: 1

1M token is around 750k words, in English. According to Wolfram Alpha that is: Single-spaced document: 1500 pages Double-spaced document: 3000 pages Book: 1028 pages So around 1-5 books. I'm assuming they're using OpenAI's tiktoken tokenizer. (??)